Alert archive / Alabama / Special Weather Statements in 2021

Special Weather Statement, NWS Birmingham, AL

February 11, 20214 counties in Alabama

NWS Birmingham, AL issued this special weather statement at Feb 11, 2021, 6:15 AM CST for 4 counties in Alabama. It was in force for 60 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Feb 11, 2021, 6:15 AM CST (12:15 UTC)
Expired: Feb 11, 2021, 7:15 AM CST
In force: 60 min
Issued by: NWS Birmingham, AL

Counties Bibb County, AL, Jefferson County, AL, Shelby County, AL, St. Clair County, AL

The radar

The Birmingham radar (KBMX), 39 km from the middle of the area, began a volume at 12:14 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 0.3 hours before the alert went out and 182 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 10 J/kg
Mixed-layer CIN: -274 J/kg
Mixed-layer LCL: 548 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 101 m²/s²
0-3 km storm-relative helicity: 119 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Birmingham, AL wrote its last area forecast discussion before this special weather statement went out at Feb 11, 4:36 AM CST, 1 hour 39 minutes earlier.

Area forecast discussion, Feb 11, 4:36 AM CST, 1 hour 39 minutes before

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<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
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  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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Hazardous weather outlook, Feb 11, 3:58 AM CST, 2 hours 17 minutes before

Hazardous Weather Outlook
National Weather Service Birmingham AL
358 AM CST Thu Feb 11 2021

ALZ011>015-017>050-121300-
Marion-Lamar-Fayette-Winston-Walker-Blount-Etowah-Calhoun-Cherokee-
Cleburne-Pickens-Tuscaloosa-Jefferson-Shelby-St. Clair-Talladega-
Clay-Randolph-Sumter-Greene-Hale-Perry-Bibb-Chilton-Coosa-Tallapoosa-
Chambers-Marengo-Dallas-Autauga-Lowndes-Elmore-Montgomery-Macon-
Bullock-Lee-Russell-Pike-Barbour-
358 AM CST Thu Feb 11 2021

This Hazardous Weather Outlook is for the counties served by the
National Weather Service office in Birmingham.

.DAY ONE...Outlook through Tonight.

Fog will reduce visibilities below one mile at times generally south
of I-20 through the overnight hours.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Fog will reduce visibilities to one mile of less across southern
areas. The fog will lift between 8 and 9 am.

The potential for winter weather exists on Monday with impacts
possible generally along and northwest of Interstate 59. A lot of
uncertainty exists in the forecast. Stay tuned for updates in coming
days.

.SPOTTER INFORMATION STATEMENT...

Activation of storm spotters and emergency management may be needed
on Monday. Please follow all local, state, and CDC guidelines in
regards to travel.

In the hours before

Special weather statement, Feb 11, 4:37 AM CST, 1 hour 38 minutes before

Special Weather Statement
National Weather Service Birmingham AL
437 AM CST Thu Feb 11 2021

ALZ012-013-022-111100-
Fayette AL-Pickens AL-Lamar AL-
437 AM CST Thu Feb 11 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN PICKENS...
SOUTHWESTERN FAYETTE AND SOUTHEASTERN LAMAR COUNTIES UNTIL 500 AM
CST...

At 436 AM CST, Doppler radar was tracking a strong thunderstorm near
Kennedy, or near Millport, moving east at 45 mph.

Pea size hail will be possible with this storm.

Locations impacted include...
Fayette, Millport, Kennedy, Belk, Ashcraft Corner, Stone Wall,
Fayette County Public Lake and Shaw.

LAT...LON 3373 8772 3358 8766 3353 8767 3352 8767
      3352 8784 3348 8784 3345 8808 3359 8812
TIME...MOT...LOC 1036Z 253DEG 39KT 3353 8800

25/Owen

Special weather statement, Feb 11, 6:15 AM CST, 0 minutes before

Special Weather Statement
National Weather Service Birmingham AL
615 AM CST Thu Feb 11 2021

ALZ023>026-034-035-111315-
Chilton AL-Bibb AL-Jefferson AL-Shelby AL-Tuscaloosa AL-St. Clair AL-
615 AM CST Thu Feb 11 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN CHILTON...
SOUTHEASTERN TUSCALOOSA...SHELBY...CENTRAL BIBB...JEFFERSON AND
SOUTHERN ST. CLAIR COUNTIES UNTIL 715 AM CST...

At 615 AM CST, Doppler radar was tracking strong thunderstorms along
a line extending from Pleasant Grove to near Low Gap. Movement was
east at 55 mph.

Pea size hail and winds in excess of 40 mph will be possible with
these storms.

Locations impacted include...
Birmingham, southeastern Tuscaloosa, Hoover, Vestavia Hills,
Alabaster, Bessemer, Homewood, Pelham, Mountain Brook, Trussville,
Helena, Hueytown, Pell City, Irondale, Leeds, Moody, Calera,
Fairfield, Chelsea and Fultondale.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3353 8720 3379 8605 3367 8615 3369 8620
      3364 8617 3359 8618 3359 8622 3354 8619
      3349 8624 3351 8628 3339 8638 3336 8634
      3329 8636 3328 8643 3320 8646 3319 8650
      3312 8646 3309 8651 3295 8652 3301 8760
TIME...MOT...LOC 1215Z 254DEG 46KT 3350 8694 3305 8737

05

The office that day

Everything else NWS Birmingham, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 10, 10:06 PM CST	Dense Fog Advisory	BMX	Autauga, Barbour, Bibb, Bullock, Chambers, Chilton and 19 more	11 hr
Feb 11, 4:37 AM CST	Special Weather Statement	BMX	Fayette	23 min
Feb 11, 8:45 AM CST	Special Weather Statement	BMX	Randolph	45 min
Feb 11, 11:09 AM CST	Special Weather Statement	BMX	Marengo	51 min

Nearby

Special Weather Statements in Alabama, 2021 Every special weather statement in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.